對影像資訊而言，使用加解密的資訊安全的技術，仍不足以保障所有權人的認證，因為當數位資料傳送至接收端並完成解密動作後，保密的效果便不復存在，也就是說，確認所有權擁有者的機制已經消失。然而，使用數位浮水印，將其嵌入資料當中，即使經過複製或有限度地破壞，數位浮水印仍存在於資料之中，可作為提供版權證明之證據，使得加密保護的工作更為完備。本論文目前已成功地利用小波轉換 (DWT)，設計出一套數位浮水印的架構，能夠抵抗多種影像處理的攻擊，符合不易察覺(Imperceptible)、強韌性(Robust)以及明確性(Unambiguous)等的要求。此外，本架構能使用可辨識的圖形為數位浮水印，提供作者在驗證所有權之確認時，增加視覺上判斷的輔助。

For image data, the technology of encryption is not enough to protect the authentication of the owner. The reason is when the image data sent to the receiver and the decryption finished, the protection of encryption is no longer existing. However, we can embed digital watermarks into the data to verify the authentication of the owner. Even if the data has been duplicated or corrupted, there is strong evidence of the existence of the watermarks. After through study and research, we have successfully designed an algorithm of digital watermarking by using discrete wavelet transform (DWT). The embedded watermarks have much better durability to defy the image processing attacks. This architecture meets the requirement of imperceptibility, robustness, and unambiguousness. Besides, we can use a visually recognizable image data as the watermark, which can give further assistance to identify the ownership of the author.

第壹章、研究主題簡介1
第一節、研究背景1
第二節、研究動機1
第三節、研究重點2
第四節、論文架構3
第貳章、數位浮水印介紹5
第一節、數位浮水印定義與分類5
第二節、數位浮水印用途6
第三節、數位浮水印製作技術7
第四節、數位浮水印範例介紹9
第參章、數位浮水印架構11
第一節、小波轉換技術11
第二節、數位浮水印嵌入程序12
第三節、數位浮水印偵測程序13
第肆章、浮水印架構的實作分析與探討15
第一節、嵌入數位浮水印對影像品質的影響15
第二節、數位浮水印架構的明確性分析17
第三節、使用亂數序列產生的數位浮水印測試18
第一項、亂數序列浮水印的產生方式18
第二項、影像在未受攻擊下的表現18
第三項、改變影像大小(Bilinear Resizing)的攻擊19
第四項、JPEG失真壓縮攻擊20
第五項、裁剪(Cropping)攻擊22
第六項、加入雜訊(Add noise)攻擊23
第七項、模糊化(Blur)攻擊24
第四節、使用可辨識的影像產生之數位浮水印測試24
第一項、可辨識的影像數位浮水印產生與偵測方式24
第二項、影像在未受攻擊下的表現26
第三項、改變影像大小(Bilinear Resizing)的攻擊27
第四項、JPEG失真壓縮攻擊28
第五項、裁剪(Cropping)攻擊29
第五節、嵌入數個數位浮水印30
第六節、數位浮水印架構之實作分析與歸納33
第五章、總結35
第一節、結論35
第二節、未來工作35
參考文獻36
附錄(一) 商業數位浮水印範例：DIGIMARC39
附錄(二) 著作46

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